Wilo Stratos MAXO Notice De Montage Et De Mise En Service page 101

2. Select "Function control input DI1" or "Function control input DI2".
Possible settings:
Selection option
Not used
External OFF
External MAX
External MIN
1)
External MANUAL
2)
External key lock
Heating/cooling switchover
Table 34: Function control input DI1 or DI2
1)
Function: See section "Adjustment - Manual operation [" 88]".
2)
Function: See "Key lock ON [" 126]" section.
3)
To guarantee the heating/cooling switchover function operates correctly at the digital input:
1. Go to "Settings" menu, "Set control mode", "Setting assistant" and select the "Heating & cooling"
application and
2. go to "Settings" menu, "Set control mode", "Heating/cooling switchover" and select the "Binary
input" option as switchover criterion.
Procedure with EXT. OFF for twin-head pumps
The function EXT. OFF always behaves as follows:
• EXT. OFF active: Contact is open, pump is stopped (OFF).
• EXT. OFF inactive: Contact is closed, pump runs in normal operation (ON).
The configuration of the control inputs has three possible modes (from SW ≥ 1.05.10.00) for EXT. OFF which
can influence the behavior of the two twin-head pump partners.
System mode
The control input of the main pump is occupied with a control cable and configured to EXT. OFF.
The control input on the main pump switches both twin-head pump partners.
The control input of the partner pump is ignored and has no significance regardless of its configuration. If
the main pump malfunctions or if the twin-head pump connection is disconnected, the partner pump is also
stopped.
Installation and operating instructions • Wilo-Stratos MAXO/-D/-Z • Ed.02/2023-10
Function control input DI1 or DI2
The control input does not have a function.
Contact open: Pump is switched off.
Contact closed: Pump is switched on.
Contact open: Pump is running in the mode set on the pump.
Contact closed: Pump is running with maximum speed.
Contact open: Pump is running in the mode set on the pump.
Contact closed: Pump is running with minimum speed.
Contact open: Pump is running in the mode set
on the pump or in mode requested via bus communication.
Contact closed: Pump is set to MANUAL.
Contact open: Key lock is deactivated.
Contact closed: Key lock is activated.
3)
Contact open: "Heating" active.
Contact closed: "Cooling" active.
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